The Mercedes-Benz gls400 comes standard with two keys, the main key and the spare key.
A spare key is a replacement for the primary key that helps the owner start the vehicle if the primary key is lost or damaged. Master key: Master key is more complex, there are many function keys on the key, can achieve remote control, one-key start and other efficient operation.
The performance of the master key is wireless remote control, and the unlocking function of the car is controlled by the wireless transmitter in the key, which is powerful. Spare key: Generally a traditional mechanical key, the key head has teeth, need to be inserted into the keyhole to turn, the vehicle can start. It's just a regular lock key